// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_QUIC_TOOLS_QUIC_SIMPLE_PER_CONNECTION_PACKET_WRITER_H_
#define NET_QUIC_TOOLS_QUIC_SIMPLE_PER_CONNECTION_PACKET_WRITER_H_

#include <stddef.h>

#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "net/quic/quic_connection.h"
#include "net/quic/quic_packet_writer.h"

namespace net {

class QuicSimpleServerPacketWriter;

// A connection-specific packet writer that notifies its connection when its
// writes to the shared QuicServerPacketWriter complete.
// This class is necessary because multiple connections can share the same
// QuicServerPacketWriter, so it has no way to know which connection to notify.
class QuicSimplePerConnectionPacketWriter : public QuicPacketWriter {
public:
    // Does not take ownership of |shared_writer| or |connection|.
    QuicSimplePerConnectionPacketWriter(
        QuicSimpleServerPacketWriter* shared_writer);
    ~QuicSimplePerConnectionPacketWriter() override;

    QuicPacketWriter* shared_writer() const;
    void set_connection(QuicConnection* connection) { connection_ = connection; }
    QuicConnection* connection() const { return connection_; }

    // Default implementation of the QuicPacketWriter interface: Passes everything
    // to |shared_writer_|.
    WriteResult WritePacket(const char* buffer,
        size_t buf_len,
        const IPAddress& self_address,
        const IPEndPoint& peer_address,
        PerPacketOptions* options) override;
    bool IsWriteBlockedDataBuffered() const override;
    bool IsWriteBlocked() const override;
    void SetWritable() override;
    QuicByteCount GetMaxPacketSize(const IPEndPoint& peer_address) const override;

private:
    void OnWriteComplete(WriteResult result);

    QuicSimpleServerPacketWriter* shared_writer_; // Not owned.
    QuicConnection* connection_; // Not owned.

    base::WeakPtrFactory<QuicSimplePerConnectionPacketWriter> weak_factory_;

    DISALLOW_COPY_AND_ASSIGN(QuicSimplePerConnectionPacketWriter);
};

} // namespace net

#endif // NET_QUIC_TOOLS_QUIC_SIMPLE_PER_CONNECTION_PACKET_WRITER_H_
